Alarm-gage.



E. NI. BARNES.

ALARM GAGE.

APPLIcAhoN r|LED1uN24,19|5.

l ,202,757 Patented Oct. 24,1916.

l. llllllllllllIl/lI/Al' @www A TT ORNE V3 :El III mil/mm EDWARD M. BARNES Apart of this specification, in

UNITED STATESy PATET OFFICE.

EDWARD M. BRNES, 0E HASTINGS, MIIIIGAN, ASSIGNOR, BY MESNE ASSIGNMENTS,

To KxiiRMAznmUTILITIEs Co.,

OF XALAMAZOO, MICHIGAN.

ALARM-GA GE.

Specification of Letters Patent.

Patented Oct. 24. 1916.

Application filed June 24, 1915. Serial No. 36,135.

To f/Z who/n it 'muy concern:

Be it known that I, Enwann M. BARNES, a citizen of the United States, residing.,r at Hastings. in the countyof Barry and State ol' Michigan, have invented certain new and useful Improvements in Alarm-Gages, of which the following is a specification.

This invention relates to improvements in alarm gages.

My improved alarm gage is especially designml by ine for use as an Oil gage for the crank cases of internal combustion engines although it is adapted for use in various relntions. y

The main objects of my invention are: First, to provide an improved alarm gage for use on the crank cases of internal combus-tion engines which is efficient and at the saine time economical to produce and one which may be readily installed 0n structures in common use such as the crank cases of motors of Ford motor cars. Second, to provide an improved alarm gage in which the parts are simple and few in number and the contacts are protected in use so that they are not likely to become ineffective through becoming coated with an insulating substance.

Further objects, and objects relating to structural details will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the :following specification.

he invention is clearly defined and pointed out in the claim.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing forming a which:

Figure I is a detail view mainly in vertical section of a 'structure embodying the features of my invention, my improved gage being shown connected to a motor crank case. Fig. II is a diagrammatic view showing the electrical connections. Fig. III is a detail vertical section of a slightly modified structure, a second pointed contact being provided.

In the drawing2 similar reference characters refer to similarV parts throughout the- :everal views.

to the drawing, 1 represents Referring but.

com p ,ion enhe crank case of an internal gine. lhe casing of my improved gage consists of a cylindricalbarrel 2, a base 3 and a cap 4. The barrelQ is threaded into the base 3 and threaded to receive the cap 4. A gasket 51s provided for the cap. The base is provided with a nipple 6 for the pipe 7 connecting the gage casingto the oil well of a crank casing as shown. This gage casing part being of metal and it being customary to ground the engine the casing is also grounded forming one of the electrical connections.

Within the casing is a cylindrical float 8 adapted to rise and fall therein, the oat pre erably being a comparatively good fit within the casing though free enough to permit it to rise and fall freely. Above the ioat is a coiled spring 9, the upper end of which engages the cap 4 and the lower end of which rests upon the Boat thus forming an electrical connection from the fioat to the casing. Below Athe float is a pointed contact 10. This contact is threaded through an insulatingV plug 11 in the bottom of the casing and is connected by the wire 12 to the signal lamp or alarm 13, shown conventionally in Fig. II. A battery 14 is shown conventionally. The circuit wire 15 is grounded in .the crank case 1 but if desired a separate pointed contact 16may be threaded into the the float shouldvbecome insulated by a covering of oil.

My improved gage alarm is simple and economical in its parts and readily applied, and is not likely to get out of repair in use, or to become ineffective as the spring9 maintains an effective electrical connection from the float to the casing while the pointed contact will pierce any film of oil that may be on the bottom of the lioat, and makes an effective Contact. This contact may be adjusted according to which it is deslred given.

I have not in the accompanying drawing attempted to maintain the relative roportions gf the float to thecrank casing, the

that the alarm shall be pierce any film of the level of the fluid at Y' onl ldraving thus described my invention, what I claim as new and desire to secure by Letters Patent, is: l

In a. structure of the class described, the combination of a cylindrical metal gage casing having connection to. the receptacle to be gaged, a cylindrical metal Boat, constituting -a circuit member, a, coiled spring arranged above said float and resting thereon,

the upper end of said spring being 1n contact with the' casing, said spring constitutan electrical connection for sgl'lloat tp 15 and a pointed c'oritwgvm {ioat to be m5 ing sald age casing, pose centrally below said gaged thereby when the float falls and threaded for adjustment in the bottom of said gage casing and insulated therefrom.

In witness whereof, I have hereunto set my hand and seal in the presence of two witnesses.

E. M. BARNES. [Le] Witnesses:

SAME L1. Gmsoow, HARRY G. HAYES. 

